Preparation method of high-barrier-property polylactic acid nano composite material

A technology of nanocomposite materials and high barrier properties, which is applied in the field of preparation of polymer nanomaterials and can solve the problems of poor heat resistance and restricted application of polylactic acid

Active Publication Date: 2015-09-02
常州龙骏天纯环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Polylactic acid is the biodegradable material with the most extensive research and development potential at present. It has good biodegradability and environmental friendliness. However, the heat resistance of polylactic acid is very poor, which restricts its application. At the same time, its The gas barrier performance also needs to be further improved to meet different application requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Preparation of polycaprolactone modified montmorillonite: feed nitrogen into a dry flask for 30min to remove oxygen, then add caprolactone monomer and montmorillonite with a mass ratio of 100:5 in the flask, Vibrate the dispersion liquid ultrasonically for 1 hour, and leave it sealed at room temperature for 24 hours to fully insert the caprolactone monomer into the montmorillonite sheet, add 0.2% initiator tetrabutyl titanate by mass of the caprolactone monomer to the flask, insert Layer polymerization was sealed at 180°C for 8 hours. The obtained product was dissolved in toluene, ultrasonically vibrated and then centrifuged. The centrifuged product was washed and centrifuged with toluene several times and then dried to obtain polycaprolactone-modified montmorillonite.

[0022] (2) Preparation of barrier masterbatch: mix polylactic acid and a small amount of silicone oil through a high-speed mixer, then add 10% polycaprolactone-modified montmorillonite and mix at hig...

Embodiment 2

[0025] (1) Preparation of polycaprolactone modified montmorillonite: feed nitrogen into a dry flask for 30min to remove oxygen, then add caprolactone monomer and montmorillonite with a mass ratio of 100:6 in the flask, Vibrate the dispersion liquid ultrasonically for 1 hour, and leave it sealed at room temperature for 24 hours, so that the caprolactone monomer is fully inserted into the montmorillonite sheet, and the initiator stannous octoate with a mass of 0.4% of the caprolactone monomer is added to the flask for intercalation polymerization Sealed at 170°C for 9h. The obtained product is dissolved in toluene, ultrasonically vibrated and then centrifuged, and the centrifuged product is washed and centrifuged with toluene for several times and then dried to obtain polycaprolactone modified montmorillonite.

[0026] (2) Preparation of barrier masterbatch: Mix polylactic acid and a small amount of silicone oil through a high-speed mixer, then add 15% polycaprolactone-modified ...

Embodiment 3

[0029] (1) Preparation of polycaprolactone modified montmorillonite: feed nitrogen into a dry flask for 30min to remove oxygen, then add caprolactone monomer and montmorillonite with a mass ratio of 100:8 in the flask, Vibrate the dispersion liquid ultrasonically for 1 hour, and leave it sealed at room temperature for 24 hours, so that the caprolactone monomer is fully inserted into the montmorillonite sheet, and the initiator tetrapropyl titanate with 0.6% mass of the caprolactone monomer is added to the flask, and the Layer polymerization was sealed at 180°C for 8 hours. The obtained product was dissolved in toluene, ultrasonically vibrated and then centrifuged. The centrifuged product was washed and centrifuged with toluene several times and then dried to obtain polycaprolactone-modified montmorillonite.

[0030] (2) Preparation of barrier masterbatch: mix polylactic acid and a small amount of silicone oil through a high-speed mixer, then add 12% polycaprolactone-modified mo...

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PUM

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Abstract

The invention discloses a preparation method of a high-barrier-property polylactic acid nano composite material. The preparation method comprises the following steps: (1) adding a caprolactone monomer and montmorillonite into a drying flask without oxygen, standing in a sealed way after ultrasonic vibration to ensure that the caprolactone monomer is fully inserted into lamellas of montmorillonite, adding an initiator into the flask, heating to perform intercalation polymerization reaction, dissolving an obtained product in methylbenzene, performing centrifugal separation after ultrasonic vibration, washing by using methylbenzene, and drying to obtain polycaprolactone modified montmorillonite; (2) mixing polylactic acid with silicon oil, adding polycaprolactone modified montmorillonite, performing high-speed mixing, and then performing extrusion granulation by using an extruder to obtain barrier master batches; and (3) uniformly mixing the barrier master batches with polylactic acid, and performing melt blending to obtain the high-barrier-property polylactic acid nano composite material. A caprolactone in-situ intercalation polymerization method is adopted to modify montmorillonite to ensure that nano lamellas of montmorillonite are effectively peeled off, and a master batch method is adopted to ensure that the nano lamellas of montmorillonite are uniformly distributed in a polylactic acid matrix to obtain relatively high barrier property.

Description

technical field [0001] The invention relates to a preparation method of a polymer nanometer material, in particular to a preparation method of a polylactic acid nanocomposite material with high barrier properties. Background technique [0002] Polylactic acid is the biodegradable material with the most extensive research and development potential at present. It has good biodegradability and environmental friendliness. However, the heat resistance of polylactic acid is very poor, which restricts its application. At the same time, its The gas barrier performance also needs to be further improved to meet different application requirements. [0003] In view of the defects in the preparation of the above-mentioned existing barrier-type polylactic acid, the inventors actively researched and innovated based on years of rich practical experience and professional knowledge in the design and manufacture of such products, and cooperated with the application of theories, in order to cre...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L83/04C08G63/08C08K3/34C08J3/22
Inventor 支朝晖李炳健
Owner 常州龙骏天纯环保科技有限公司
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